#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
#
# @param jewels string字符串
# @param stones string字符串
# @return int整型
#
class Solution:
    def numJewelsInStones(self, jewels: str, stones: str) -> int:
        # write code here
        a, r = set(), 0     # 用set集合去重
        for j in jewels:
            a.add(j)
        for s in stones:
            if s in a:
                r += 1
        return r